US20150040561A1 - Control device for internal combustion engine - Google Patents

Control device for internal combustion engine Download PDF

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Publication number
US20150040561A1
US20150040561A1 US14/386,121 US201214386121A US2015040561A1 US 20150040561 A1 US20150040561 A1 US 20150040561A1 US 201214386121 A US201214386121 A US 201214386121A US 2015040561 A1 US2015040561 A1 US 2015040561A1
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Prior art keywords
open degree
exhaust gas
valve
turbine
internal combustion
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Abandoned
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US14/386,121
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English (en)
Inventor
Hiroki Matsui
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Toyota Motor Corp
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Toyota Motor Corp
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Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA reassignment TOYOTA JIDOSHA KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MATSUI, HIROKI
Publication of US20150040561A1 publication Critical patent/US20150040561A1/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
    • F02B37/183—Arrangements of bypass valves or actuators therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/08—Other arrangements or adaptations of exhaust conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
    • F01N5/04—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using kinetic energy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/22—Control of the pumps by varying cross-section of exhaust passages or air passages, e.g. by throttling turbine inlets or outlets or by varying effective number of guide conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2260/00—Exhaust treating devices having provisions not otherwise provided for
    • F01N2260/06—Exhaust treating devices having provisions not otherwise provided for for improving exhaust evacuation or circulation, or reducing back-pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2340/00—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses
    • F01N2340/06—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses characterised by the arrangement of the exhaust apparatus relative to the turbine of a turbocharger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/04—Methods of control or diagnosing
    • F01N2900/0422—Methods of control or diagnosing measuring the elapsed time
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
    • F01N2900/06—Parameters used for exhaust control or diagnosing
    • F01N2900/08—Parameters used for exhaust control or diagnosing said parameters being related to the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to a control device for an internal combustion engine that includes a turbocharger.
  • the forced induction device includes a wastegate mechanism that allows exhaust gas to bypass the turbine wheel and be discharged.
  • the wastegate mechanism includes a wastegate port that bypasses the turbine wheel and a wastegate valve that opens and closes the wastegate port. For example, when the pressure of the exhaust gas delivered to the turbine wheel is greater than or equal to a predetermined value, the exhaust gas is discharged through the wastegate port by opening the wastegate valve. This avoids the application of excessive pressure to the turbine wheel, and limits excessive increases of the boost pressure.
  • a porous exhaust gas purification catalyst that purifies the exhaust gas is arranged at a downstream side of the turbine, which is arranged in the exhaust passage.
  • Patent Document 1 Japanese Laid-Open Patent Publication No. 2007-247560
  • An internal combustion engine may use fuel including a metal such as manganese.
  • the metal since the exhaust gas includes the above metal, the metal is deposited on the exhaust gas purification catalyst. It is difficult to process the deposited metal, which may clog the exhaust gas purification catalyst. Due to limitations imposed on the layout of the exhaust system, there is a tendency for exhaust gas to strike a particular portion at the inlet of the exhaust gas purification catalyst. Thus, local clogging may occur. This may cause early deterioration of the performance of the exhaust gas purification catalyst.
  • a control device for an internal combustion engine is applied to the internal combustion engine that includes a turbocharger and an exhaust gas purification catalyst.
  • the turbocharger includes a turbine arranged in an exhaust passage and a wastegate mechanism including a port, which bypasses a turbine wheel of the turbine, and a valve, which opens and closes the port.
  • the exhaust gas purification catalyst is located at a downstream side of the turbine with respect to exhaust gas.
  • the control device controls an open degree of the valve.
  • the open degree of the valve is changed in a range greater than or equal to a minimum open degree that is a minimum value of the open degree of the valve at which a flow rate of the exhaust gas flowing through the port stops increasing when the open degree of the valve is changed to an opening side.
  • the open degree of the wastegate valve changes between the minimum open degree and a value greater than the minimum open degree. This changes the flow direction of the exhaust gas discharged through the port so that the flowing direction is not fixed. Therefore, the exhaust gas is restricted from continuously and locally striking the inlet of the exhaust gas purification catalyst, and the exhaust gas is allowed to strike a larger area of the inlet. This limits local clogging of the exhaust gas purification catalyst. Under this situation, the flow rate of the exhaust gas that flows through the port remains unchanged while the open degree of the wastegate valve changes. This accurately limits local clogging of the exhaust gas purification catalyst.
  • the open degree of the valve when the open degree of the valve is changed, preferably, the open degree is changed whenever a predetermined period elapses.
  • the open degree of the valve while controlling the open degree of the valve based on a running state of the engine, when the open degree of the valve, which is set based on the running state of the engine, is greater than or equal to the minimum open degree, the open degree of the valve is changed in a range greater than or equal to the minimum open degree.
  • the open degree of the wastegate valve is controlled based on the engine running state, and the boost pressure is controlled accordingly in a preferred manner. Further, in the above structure, when the open degree of the wastegate valve, which is set based on the engine running state, is greater than or equal to the minimum open degree, the open degree of the wastegate valve changes in a range greater than or equal to the minimum open degree. This accurately limits local clogging of the exhaust gas purification catalyst without hindering the control of the boost pressure.
  • the open degree of the valve is changed in a range greater than or equal to the minimum open degree.
  • a metal such as manganese included in an exhaust gas tends to be deposited on an exhaust gas purification catalyst especially when the vehicle is travelling at a high constant speed.
  • the open degree of the wastegate valve is set to be greater than or equal to the minimum open degree. Therefore, the above structure accurately limits local deposition of a metal such as manganese on the exhaust gas purification catalyst.
  • an internal combustion engine may include an exhaust passage in which a connector is bent between a turbine and an exhaust gas purification catalyst.
  • the port of a wastegate mechanism, which is aligned with the outlet of the turbine, and the exhaust gas purification catalyst are located at opposite sides of the rotation axis of the turbine wheel.
  • the valve is a flap-type valve that opens in the downstream direction of the exhaust gas about a pivot point located at a side of the port opposite to the rotation axis.
  • the exhaust gas directly strikes the exhaust gas purification catalyst when the valve opens. This facilitates the warming of the exhaust gas purification catalyst.
  • exhaust gas strikes a larger area of the inlet of the exhaust gas purification catalyst. Consequently, this limits local clogging of the exhaust gas purification catalyst.
  • FIG. 1 is a cross-sectional view showing the cross-sectional structure of an exhaust passage and a turbine in relation to a control device for an internal combustion engine according to one embodiment of the present invention.
  • FIG. 2 is a graph showing one example of the relationship between the open degree of a wastegate valve and the flow rate of an exhaust gas flowing through a wastegate port of the embodiment.
  • FIG. 3 is a flowchart showing the procedures executed to control the open degree of the wastegate valve of the embodiment.
  • FIG. 4 is a cross-sectional view showing the cross-sectional structure of the exhaust passage and the turbine to illustrate the operation of the embodiment.
  • FIGS. 1 to 4 One embodiment of the present invention that is employed as a control device for an internal combustion engine installed in a vehicle will now be described with reference to FIGS. 1 to 4 .
  • FIG. 1 shows the cross-sectional structure of an exhaust passage where a turbine is located in an internal combustion engine of the present embodiment.
  • the turbine 12 includes a turbine housing 14 and a turbine wheel 16 , which is encased in the turbine housing 14 .
  • the rotation axis T of the turbine wheel 16 extends in the right-left direction of the drawing.
  • a compressor wheel is axially connected to the turbine wheel 16 . The compressor wheel is rotationally driven when the turbine wheel 16 is rotationally driven.
  • An inlet 17 of the turbine housing 14 is connected to an exhaust manifold.
  • the connector 4 which is connected to an outlet 18 of the turbine housing 14 , is bent at an intermediate position and extends downward as viewed in the drawing.
  • the connector 4 is also connected to the catalytic converter 40 .
  • a porous exhaust gas purification catalyst 41 which purifies the exhaust gas, is arranged inside the catalytic converter 40 .
  • the turbine housing 14 incorporates a wastegate mechanism 20 , which allows the exhaust gas to bypass the turbine wheel 16 and be discharged. More specifically, a wastegate port 22 , which serves as a passage that bypasses the turbine wheel 16 , is formed inside the turbine housing 14 . The wastegate port 22 is formed above the rotation axis
  • the wastegate port 22 and the exhaust gas purification catalyst 41 are located at opposite sides of the rotation axis T of the turbine wheel 16 . Also, the wastegate port 22 is aligned, in a direction orthogonal to the rotation axis
  • a wastegate valve 24 which is electrically driven to open and close the wastegate port 22 , is arranged inside the turbine housing 14 .
  • the wastegate valve 24 is a flap-type valve that pivotally opens in a downstream direction of the exhaust gas.
  • the pivot point of the wastegate valve 24 is located at the side of the wastegate port 22 opposite to the rotation axis T.
  • exhaust gas directly strikes the exhaust gas purification catalyst 41 when the wastegate valve 24 opens. This facilitates the warming of the exhaust gas purification catalyst 41 .
  • the wastegate port 22 and the wastegate valve 24 form the wastegate mechanism 20 .
  • the turbine 12 and the wastegate mechanism 20 form a turbocharger (hereinafter, forced induction device 10 ).
  • An electronic control unit 50 executes a variety of controls in the internal combustion engine including the control of the open degree of the wastegate valve 24 .
  • the electronic control unit 50 which functions as a controller, includes a central processing unit (CPU) that performs calculations related to various controls, a read-only memory (ROM) that stores programs and data for various controls, and a random access memory (RAM) that temporarily stores calculation results and the like.
  • the electronic control unit 50 reads detection signals from various sensors, performs various calculations, and controls the engine based on the results.
  • the various sensors include an engine speed sensor that detects the engine speed, a throttle sensor that detects the depression amount of an accelerator, an air flow sensor that detects the amount of the intake air, a vehicle speed sensor that detects the traveling speed of the vehicle, a boost pressure sensor that detects the boost pressure, a coolant temperature sensor that detects the temperature of a coolant, and the like.
  • the electronic control unit 50 performs various calculations based on signals output from the sensors and executes various controls on the internal combustion engine based on the calculation results.
  • FIG. 2 shows one example of the relationship between the open degree WA of the wastegate valve 24 and the flow rate of the exhaust gas flowing through the wastegate port 22 .
  • the physical maximum value of the open degree WA of the wastegate valve 24 is defined as a third predetermined open degree W 3 .
  • a third predetermined open degree W 3 As shown in FIG. 2 , as the open degree WA of the wastegate valve 24 increases, the flow rate of the exhaust gas flowing through the wastegate port 22 increases accordingly. However, when the open degree WA of the wastegate valve 24 is greater than or equal to a first predetermined open degree W 1 , which is smaller than the third predetermined open degree W 3 , the flow rate of the exhaust gas flowing through the wastegate port 22 increases only slightly when the open degree WA is increased.
  • the wastegate valve 24 is set to fully close. This allows the pressure of the exhaust gas to be actively applied to the turbine wheel 16 , which in turn, increases the rotation speed of the compressor wheel. As a result, the boost pressure increases, and the engine output increases.
  • the open degree WA of the wastegate valve 24 is set to the first predetermined open degree W 1 .
  • the exhaust gas may be actively discharged through the wastegate port 22 . This avoids the application of an excessive pressure of the exhaust gas to the turbine wheel 16 and limits excessive increases of the boost pressure.
  • the open degree WA of the wastegate valve 24 is changed in a range that is greater than or equal to the first predetermined open degree W 1 . This accurately limits local clogging of the exhaust gas purification catalyst 41 without hindering the control of the boost pressure.
  • FIG. 3 is a flowchart showing the procedures executed to control the open degree of the wastegate valve 24 of the present embodiment.
  • the series of processes shown in the flowchart is repeatedly executed by the electronic control unit 50 in a predetermined cycle when the engine is running.
  • step S 1 it is determined whether or not the vehicle is traveling at a high constant speed state. Specifically, it is determined based on signals output from the vehicle speed sensor that the vehicle is travelling at a high constant speed when the vehicle speed is greater than or equal to a predetermined value (for example, 100 kilometers) and the speed variation of the vehicle speed is less than or equal to a predetermined value. If the result indicates that the vehicle is not travelling at a high constant speed (step S 1 : NO), the processing proceeds to step S 3 , and the open degree WA of the wastegate valve 24 is set based on the driving state of the engine (0 ⁇ WA ⁇ W 1 ). Then, the series of processes are temporarily terminated.
  • a predetermined value for example, 100 kilometers
  • step S 1 if the vehicle is travelling at a high constant speed (step S 1 : YES), the processing proceeds to step S 2 , and the open degree WA of the wastegate valve 24 is changed in a range that is greater than or equal to the first predetermined open degree W 1 . Then, the series of processes are temporarily terminated.
  • the open degree WA of the wastegate valve 24 is set so that the open degree WA of the wastegate valve 24 changes in a stepped manner between the first predetermined open degree W 1 and a second predetermined open degree W 2 whenever a predetermined period elapses (for example, 1 second) (W 1 ⁇ WA ⁇ W 2 ).
  • the open degree WA of the wastegate valve 24 is gradually increased from the first predetermined open degree W 1 by a predetermined change amount LW whenever the predetermined period elapses.
  • the open degree WA of the wastegate valve 24 is gradually decreased from the second predetermined open degree W 2 by the predetermined change amount LW whenever the predetermined period elapses.
  • FIG. 4 the position of the wastegate valve 24 and the direction of the exhaust gas flowing through the wastegate valve 24 when the open degree of the wastegate valve 24 is the first predetermined open degree W 1 are indicated by solid lines. Also, in FIG. 4 , the position of the wastegate valve 24 and the direction of the exhaust gas flowing through the wastegate valve 24 when the open degree of the wastegate valve 24 is the second predetermined open degree W 2 are indicated by double-dashed lines.
  • the open degree WA of the wastegate valve 24 is controlled based on a driving state of the engine, and accordingly, the boost pressure is suitably controlled.
  • the open degree WA of the wastegate valve 24 changes in a range that is greater than or equal to the first predetermined open degree W 1 .
  • the flow direction of the exhaust gas discharged through the wastegate port 22 changes and is not fixed. This limits continuous striking of the exhaust gas locally at the inlet 42 of the exhaust gas purification catalyst 41 , so that the exhaust gas strikes the inlet 42 over a wider area.
  • the first predetermined open degree W 1 corresponds to the minimum open degree according to the present invention.
  • the control device for the internal combustion engine of the present embodiment has the advantages described below.
  • the first predetermined open degree W 1 is set to the minimum value of the wastegate valve 24 at which the flow rate of the exhaust gas flowing through the wastegate port 22 stops increasing when the open degree WA of the wastegate valve 24 is further changed toward the opening side.
  • the electronic control unit 50 controls the open degree WA of the wastegate valve 24 based on the engine running state. Further, the electronic control unit 50 changes the open degree of the wastegate valve 24 in a range greater than or equal to the first predetermined open degree W 1 when the vehicle is travelling at a high constant speed. This structure limits local clogging of the exhaust gas purification catalyst 41 without hindering the control of the boost pressure.
  • the open degree WA of the wastegate valve 24 When changing the open degree WA of the wastegate valve 24 , the open degree WA is changed in a stepped manner whenever a predetermined period elapses. In such a configuration, the portion of the inlet 42 of the exhaust gas purification catalyst 41 that the exhaust gas strikes changes in a stepped manner whenever a predetermined period elapses. This simplifies the control configuration for changing the open degree WA of the wastegate valve 24 .
  • the connector 4 which connects the turbine 12 to the exhaust gas purification catalyst 41 , is bent.
  • the wastegate port 22 which is aligned with the outlet 18 of the turbine 12 , and the exhaust gas purification catalyst 41 are located at opposite sides of the rotation axis T of the turbine wheel 16 .
  • the wastegate valve 24 is a flap-type valve that pivotally opens in the downstream direction of the exhaust gas. The pivot point of the wastegate valve 24 is located at the side of the wastegate port 22 opposite to the rotation axis T. This structure facilitates the warming of the exhaust gas purification catalyst 41 and limits local clogging of the exhaust gas purification catalyst 41 .
  • control device for the internal combustion engine according to the present invention is not limited to the structure illustrated in the above embodiment.
  • the above embodiment may be modified as described below.
  • the open degree WA of the wastegate valve 24 is changed in a stepped manner whenever the predetermined period elapses. Instead, the flow amount of the exhaust gas may be summed, and the open degree WA of the wastegate valve 24 may be changed whenever the summed value reaches a predetermined value.
  • the above embodiment illustrates the electrically driven wastegate valve 24 .
  • the wastegate valve may be a hydraulically driven valve or a vacuum operated valve.
  • the above embodiment employs the bent connector 4 .
  • the layout in the exhaust gas system of the internal combustion engine is not limited to this structure.
  • a straight connector may be employed.
  • the above embodiment illustrates the wastegate mechanism 20 that is incorporated in the turbine housing 14 .
  • the wastegate mechanism may be located outside the turbine housing.
  • the open degree WA of the wastegate valve 24 when the vehicle is travelling at a high constant speed, the open degree WA of the wastegate valve 24 is changed in a range that is greater than or equal to the first predetermined open degree W 1 .
  • the present invention is not limited to this configuration.
  • the open degree WA of the wastegate valve 24 may be changed in the range greater than or equal to the first predetermined open degree W 1 in a different engine running state.
  • the open degree WA of the wastegate valve 24 when the open degree WA of the wastegate valve 24 is changed, the open degree WA is changed whenever a predetermined period elapses.
  • the duration of each open degree may be set to be variable in correspondence with the open degree of the wastegate valve 24 . In this case, it is desirable that the relationship between the open degree of the wastegate valve and the duration of the open degree is set based on experiments or the like conducted in advance so that exhaust gas evenly strikes each portion in the inlet of an exhaust gas purification catalyst.
  • the open degree when changing the open degree of the wastegate valve, the open degree may be continuously changed.
  • the open degree WA of the wastegate valve 24 when the open degree WA of the wastegate valve 24 , which is set based on the driving state of the engine, is the first predetermined open degree W 1 (minimum open degree), the open degree of the wastegate valve 24 is changed in a range that is greater than or equal to the first predetermined open degree W 1 .
  • the open degree WA of the wastegate valve 24 when the open degree WA of the wastegate valve 24 , which is set based on the engine running state, is an open degree that is slightly toward the closing side from the first predetermined open degree W 1 , the open degree of the wastegate valve 24 may be changed in a range greater than or equal to the first predetermined open degree W 1 .
  • the control of the boost pressure is slightly hindered, local clogging of the exhaust gas purification catalyst 41 is accurately limited.
  • the open degree WA of the wastegate valve 24 based on whether or not the vehicle is traveling at a high constant speed, it is determined whether or not to change the open degree WA of the wastegate valve 24 in a range greater than or equal to the first predetermined open degree W 1 (refer to step S 1 of the flowchart in FIG. 3 ).
  • the open degree WA of the wastegate valve 24 may be changed in a range greater than or equal to the first predetermined open degree W 1 even when the vehicle is traveling at high speed under a high load. For example, when a vehicle is towing an object while climbing a hill, the vehicle speed is low but the engine load is high. In this case, the open degree WA of the wastegate valve 24 is changed in a range greater than or equal to the first predetermined open degree W 1 . This accurately limits local clogging of the exhaust gas purification catalyst 41 .

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Supercharger (AREA)
  • Exhaust Gas After Treatment (AREA)
US14/386,121 2012-03-30 2012-03-30 Control device for internal combustion engine Abandoned US20150040561A1 (en)

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US20160356207A1 (en) * 2015-06-06 2016-12-08 Man Truck & Bus Ag Exhaust Tract For An Internal Combustion Engine
DE202015008909U1 (de) * 2015-12-17 2017-03-20 Borgwarner Inc. Wastegateanordnung für Turbine eines Abgasturboladers
US20170145936A1 (en) * 2015-11-24 2017-05-25 Toyota Jidosha Kabushiki Kaisha Control apparatus for an internal combustion engine
US20180038290A1 (en) * 2015-03-30 2018-02-08 Mitsubishi Heavy Industries, Ltd. Turbine supercharger and two-stage supercharging system
US20190136736A1 (en) * 2017-11-09 2019-05-09 Aisin Takaoka Co., Ltd. Catalytic converter
US10526958B2 (en) 2016-03-23 2020-01-07 Borgwarner Inc. Reverse offset wastegate valve assembly for improved catalyst light-off performance
US10557396B2 (en) * 2017-07-03 2020-02-11 Toyota Jidosha Kabushiki Kaisha Exhaust system for an internal combustion engine
US10837353B2 (en) 2015-11-09 2020-11-17 Mitsubishi Heavy Industries Engine & Turbocharger, Ltd. Pipe connection structure

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3018854A3 (fr) * 2014-03-20 2015-09-25 Renault Sa Deflecteur integre au carter de turbocompresseur
GB2528097A (en) * 2014-07-09 2016-01-13 Jaguar Land Rover Ltd Wastegate valve
FR3032230B1 (fr) * 2015-02-04 2017-02-10 Peugeot Citroen Automobiles Sa Ensemble a deflecteur de gaz d'echappement situe en sortie de turbine de turbocompresseur
US10760437B2 (en) * 2016-09-30 2020-09-01 Garrett Transportation I Inc. Turbocharger with ported turbine shroud
DE102016119255A1 (de) * 2016-10-10 2018-04-12 Ihi Charging Systems International Gmbh Abgasführungsabschnitt für einen Abgasturbolader und Abgasstrang für eine Verbrennungskraftmaschine sowie Verfahren zum Betreiben eines Abgasturboladers
JP6461069B2 (ja) * 2016-11-22 2019-01-30 本田技研工業株式会社 内燃機関の制御装置
JP6792432B2 (ja) * 2016-11-30 2020-11-25 ダイハツ工業株式会社 内燃機関
JP6547783B2 (ja) * 2017-02-24 2019-07-24 トヨタ自動車株式会社 内燃機関の排気システム
JP6528799B2 (ja) * 2017-05-19 2019-06-12 トヨタ自動車株式会社 内燃機関の排気浄化システム
US10590837B2 (en) * 2017-12-15 2020-03-17 Fca Us Llc Turbocharger wastegate assembly
JP6844556B2 (ja) * 2018-02-09 2021-03-17 トヨタ自動車株式会社 内燃機関の排気浄化装置
JP6629898B2 (ja) * 2018-02-27 2020-01-15 本田技研工業株式会社 内燃機関の排気浄化装置
JP7207115B2 (ja) * 2019-04-09 2023-01-18 トヨタ自動車株式会社 ハイブリッド車両

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006097559A (ja) * 2004-09-29 2006-04-13 Mazda Motor Corp 過給機付きエンジンの過給圧制御装置
DE102004052670A1 (de) * 2004-10-29 2006-05-04 Daimlerchrysler Ag Verfahren zum Betrieb einer Brennkraftmaschine im Motorbremsbetrieb
US7677227B2 (en) * 2005-07-04 2010-03-16 Denso Corporation Apparatus and method of abnormality diagnosis for supercharging pressure control system
JP2007009877A (ja) * 2005-07-04 2007-01-18 Denso Corp 過給圧制御システムの異常診断装置
JP2007247560A (ja) 2006-03-16 2007-09-27 Toyota Motor Corp 内燃機関
WO2010058461A1 (ja) * 2008-11-19 2010-05-27 トヨタ自動車株式会社 内燃機関の制御装置
JP2011144762A (ja) * 2010-01-15 2011-07-28 Mitsubishi Heavy Ind Ltd ウエストゲートバルブ
JP5170343B2 (ja) * 2010-03-17 2013-03-27 トヨタ自動車株式会社 内燃機関の制御装置
JP2012002094A (ja) * 2010-06-15 2012-01-05 Toyota Motor Corp 内燃機関

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180038290A1 (en) * 2015-03-30 2018-02-08 Mitsubishi Heavy Industries, Ltd. Turbine supercharger and two-stage supercharging system
US10697377B2 (en) * 2015-03-30 2020-06-30 Mitsubishi Heavy Industries Engine & Turbocharger, Ltd. Turbine supercharger and two-stage supercharging system
US20160356207A1 (en) * 2015-06-06 2016-12-08 Man Truck & Bus Ag Exhaust Tract For An Internal Combustion Engine
US10837353B2 (en) 2015-11-09 2020-11-17 Mitsubishi Heavy Industries Engine & Turbocharger, Ltd. Pipe connection structure
US20170145936A1 (en) * 2015-11-24 2017-05-25 Toyota Jidosha Kabushiki Kaisha Control apparatus for an internal combustion engine
US10458348B2 (en) * 2015-11-24 2019-10-29 Toyota Jidosha Kabushiki Kaisha Control apparatus for an internal combustion engine
DE202015008909U1 (de) * 2015-12-17 2017-03-20 Borgwarner Inc. Wastegateanordnung für Turbine eines Abgasturboladers
US10526958B2 (en) 2016-03-23 2020-01-07 Borgwarner Inc. Reverse offset wastegate valve assembly for improved catalyst light-off performance
US10557396B2 (en) * 2017-07-03 2020-02-11 Toyota Jidosha Kabushiki Kaisha Exhaust system for an internal combustion engine
US20190136736A1 (en) * 2017-11-09 2019-05-09 Aisin Takaoka Co., Ltd. Catalytic converter
US10704445B2 (en) * 2017-11-09 2020-07-07 Aisin Takaoka Co., Ltd. Catalytic converter

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JP5858143B2 (ja) 2016-02-10
WO2013145278A1 (ja) 2013-10-03
CN104204447A (zh) 2014-12-10
EP2832968A1 (en) 2015-02-04
EP2832968A4 (en) 2015-07-08
IN2014DN07830A (ja) 2015-04-24
JPWO2013145278A1 (ja) 2015-08-03

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